package com.sky.service.impl;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();
        String encryptedPwd=DigestUtils.md5DigestAsHex(password.getBytes());//对密码进行md5加密

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        /*
            2、处理各种登录失败的情况（用户名不存在、密码不对、账号被锁定）
            抛出异常之后，通过全局异常处理解决
         */
        if (employee == null) { //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        if (!encryptedPwd.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    @Override
    public void add(EmployeeDTO employeeDTO){
        Employee employee=new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        employee.setStatus(StatusConstant.ENABLE);
        employeeMapper.insertEmployee(employee);
    }

    @Override
    public PageResult page(EmployeePageQueryDTO employeePageQueryDTO) {
        //分页查询第①步：先使用PageHelper.startPage设定分页查询的pageNum和pageSize
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        List<Employee> employeeList = employeeMapper.pageSearch(employeePageQueryDTO.getName());
        //分页查询第②步：使用PageInfo获得分页查询所需的信息
        PageInfo<Employee> pageInfo = new PageInfo<>(employeeList);
        //分页查询第③步：封装标准PageResult对象
        return new PageResult(pageInfo.getTotal(), pageInfo.getList());
    }

    @Override
    public void changeStatus(Integer status, Long id) {

        /*
            分析：此处考虑直接开发一个根据id修改Employee信息的通用Mapper方法，如果后期要用，可以增加复用度
            所以需要将修改信息封装成一个Employee对象
         */
        Employee employee = Employee.builder()
                .status(status)
                .id(id).build();
        int rows=employeeMapper.updateById(employee);
        if(rows==0) { //id对应账户未找到
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }
    }

    @Override
    public Employee searchById(Long id) {
        Employee employee=employeeMapper.selectById(id);
        if(employee==null) { //id对应的员工不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        } else {
            return employee;
        }
    }

    @Override
    public void changeInfo(EmployeeDTO employeeDTO) {
        Employee employee=new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
        if(employeeMapper.updateById(employee)==0) { //修改失败
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }
    }

}
